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(No Model. Sheets-Sheet 1 2 H. PAPE 82 W. HENNEBERG. APPARATUS FORGRADING AND REMOVING DUST FROM PULVBBIZED ORB, &c.

No. 584,647. Patented June 15, 1897.

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(No Model.) Sheets-Sheet 2 H. PAPE 8: W. HENNEBERG. APPARATUS FORGRADING AND REMOVING DUST FROM PULVERIZED ORE, &c.

No. 584,647. Patented June 15, 1897.

W fg z7izdzzz%zizficzy A I 7 W W- I a J Ma UNTTED STATES PATENT Orricn.

HERMANN PAPE AND WILHELM HENNEBERG, OF HAMBURG, GERMANY.

APPARATUS FOR GRADING AND REMOVING DUST FROM PULVERIZED ORE, &c.

SPECIFICATION forming part of Letters Patent No. 584,647, dated June 15,1897. Application filed October 31, 1896- Serial No. 610,762. (Nomodel.)

To all whom it may concern.-

Be it known that we, HERMANN PAPE and WILHELM HENNEBERG, engineers,citizens of Hamburg, residing at 36 Hohe Bleichen, Hamburg, in theEmpire of Germany, have invented certain new and useful Apparatus forGrading and Removing Dust from Pulverized Ore and other Gran ulatedMaterials, of which the following is a specification.

This invention relates to apparatus for removing dust from pulverizedores and such like substances and, if necessary, to separate the residueinto grades of different size or gravity.

There are already in use various apparatus by which falling pulverizedmaterials are acted on by currents of air which carry away the dust anddeflect more or less the falling material so that the particles ofdifferent size and gravity are collected in separate groups. In suchapparatus it is very desirable that the current of air should, as far aspossible, act upon the powdered material throughout the Whole fall ofthe particles, that it should be practicable to vary the velocity of thecurrent at different places, and that eddies should be avoided in theinterior of the apparatus. In order to fulfil these conditions, thesides of the apparatus. by which the air enters are constructed of sievefabrics or finely-perforated metal or other material. In passing throughthese the air-current meets with frictional resistance which is greaterthe smaller the apertures and the greater the thickness of theperforated or pervious material, so that the quantity of the air whichpasses through it depends upon its texture and thickness. Thus with agiven volume of air exhausted the inflow of air from without maybespread over a pervious surface of any desired area, and the air-currentmay thus be made to play upon any required heightof fall if the textureor material forming the sides of the apparatus is suitably selected. Noeddies are formed, as the air-filaments, immediately after passing thepervious side, unite into one steady current passing through theapparatus; also, the velocity of successive parts of the height may bevaried by varying the thickness and perforations of the correspondingparts of the sides.

Figure 1 of the accompanying drawings repby the air-current entering atg.

resents an apparatus of cylindrical form for the removal of dust. Thematerial drops through the funnel a 011 the conical distributer 7) andthence in the form of an annular stream down the interior of theapparatus. By a central eXhaust tube 0 air is drawn through the pervioussides, separating the dust, which is carried away by thetube 0, whilethe material freed from dust passes away by the cone cl to the centralchute d. Fig. 2 represents a similar apparatus modified so as to effectnot only the removal of the dust, but also a classification or gradingof the granulated residue. For this purpose there is provided aninternal vessel 6, into which the least heavy particles drop, beingdeflected In order to prevent eddies at the upper edge of 6, air isdrawn through it, entering through the pervious side 72, the conicaldeflector f preventing the air drawn through g from flowing upwardwithout passing through h. Fig. 3 is a section of an apparatus ofrectangular form.

The crushed material dropping through the funnel a is'first acted on byair entering at 1), driving forward the lightest particles, while theheaviest fall into the first recess and are carried away by a worm orother conveyer g. Air-currents entering at successive places int 41. actin the same way, separating the material into classes, which are removedby the conveyors h, i, and 7c, the dust passing away by the outlet f.

The arrangement of pervious sides in apparatus for grading pulverizedmaterials may be varied in many Ways; butit is essential that theyshould be such that the air-currents are directed on the descendingmaterial through a considerable height of its fall.

The use of ventilating perforated sides in air sifting-machines may bevaried as to many other details; but the object of ventilatingsides willremain the same viz. to distribute the air-current over a surface ofsuch size and shape that the fallingmaterial is met throughout asufficient length of fall by a steadyfiowing current of air.

Having thus described the natureof this invention and the best means weknow of carrying the same into practical effect, we claim- In anapparatus for separating dust from pulverized materials, the combinationwith a cylindrical casing having pervious walls and provided at itsupper end with a feed-- hopper and at its lower end with adischargeoutlet, of an air-exhaust pipe extending up through the bottomof the casing to the upper portion thereof, a conical deflector arrangedabove the upper end of said pipe, a

cylindrical shell e arranged between the lower and a conical deflectorarranged above said I 5 pervious side Walls and between the casing andshell, substantially as described and for the purpose specified.

In testimony whereof we have signed our names to this specification, inthe presence of 20 two subscribing witnesses, this 12th day of October,A. D. 1896.

I-IERMANN PAPE. WILHELM I-IENNEBERG.

Witnesses:

E. IIH. MUMMENHOFF, OHAs. H. BURKE.

